Skip baking and validation phases for "non-configurable" actions

For actions that don't actually use the configured project information—such Premake's own embed, test, and release actions—the results of baking and validation phases aren't used, and the extra processing just takes up unnecessary time. Detect this case by checking the action for an onSolution() or onProject() call; if there isn't one, if isn't configurable.

If you have a custom action that does all its work in execute() that *does* need configurable information, you can just define a empty onSolution() function.

src/_premake_main.lua

@@ -217,7 +217,7 @@
 				os.exit(1)
 			end
 
-			if not os.isfile(_MAIN_SCRIPT) then
+			if p.action.isConfigurable() and not os.isfile(_MAIN_SCRIPT) then
 				print(string.format("No Premake script (%s) found!", path.getname(_MAIN_SCRIPT)))
 				os.exit(1)
 			end
@@ -230,8 +230,10 @@
 ---
 
 	function m.preBake()
+		if p.action.isConfigurable() then
 			print("Building configurations...")
 		end
+	end
 
 
 ---
@@ -239,8 +241,10 @@
 ---
 
 	function m.bake()
+		if p.action.isConfigurable() then
 			premake.oven.bake()
 		end
+	end
 
 
 ---
@@ -257,8 +261,10 @@
 ---
 
 	function m.validate()
+		if p.action.isConfigurable() then
 			p.container.validate(p.api.rootContainer())
 		end
+	end
 
 
 ---
@@ -287,5 +293,7 @@
 ---
 
 	function m.postAction()
+		if p.action.isConfigurable() then
 			print("Done.")
 		end
+	end

src/base/action.lua

@@ -160,6 +160,28 @@
 	end
 
 
+---
+-- Determines if an action makes use of the configuration information
+-- provided by the project scripts (i.e. it is an exporter) or if it
+-- simply performs an action irregardless of configuration, in which
+-- case the baking and validation phases can be skipped.
+---
+
+	function action.isConfigurable(self)
+		if not self then
+			self = action.current() or {}
+		end
+		if self.onSolution or self.onsolution then
+			return true
+		end
+		if self.onProject or self.onproject then
+			return true
+		end
+		return false
+	end
+
+
+
 ---
 -- Activates a particular action.
 --